National Northwest Marine Renewable Energy Center (NNMREC) Publicationshttp://hdl.handle.net/1957/12131
Tue, 31 Mar 2015 18:23:57 GMT2015-03-31T18:23:57Z2012 Annual Operations & Monitoring Report: North Energy Test Sitehttp://hdl.handle.net/1957/42500
2012 Annual Operations & Monitoring Report: North Energy Test Site
Henkel, Sarah K.; Haxel, Joseph H.; Schultz, Adam; Hofford, Anna
The first wave energy test at the Northwest National Marine Renewable Energy Center’s (NNMREC) North Energy Test Site (NETS) off the coast of Newport, OR took place in 2012 with the deployment of the WET-NZ wave energy conversion (WEC) device and the Ocean Sentinel instrumentation buoy. The WET-NZ and Ocean Sentinel were deployed from late August to early October 2012; several monitoring surveys were performed at the test site prior to, during and after the deployment. The main body of this revised report (Section 2: Monitoring & Thresholds) includes a more thorough comparison of the monitoring results to the 2012 WET-NZ/ Ocean Sentinel AMP thresholds and AMF thresholds. Finally, general findings and considerations for potential modifications to adaptive mitigation and adaptive management provisions are provided in Section 4: Overall Conclusions & Recommendations. It is important to note that the considerations and recommendations in this report have been provided by NNMREC and do not constitute any changes to the Adaptive Management Framework.
Wed, 19 Jun 2013 00:00:00 GMThttp://hdl.handle.net/1957/425002013-06-19T00:00:00ZFinding and Optimal Placement Depth for a Tidal In-Stream Energy Conversion Device in an Energetic, Baroclinic Tidal Channelhttp://hdl.handle.net/1957/41897
Finding and Optimal Placement Depth for a Tidal In-Stream Energy Conversion Device in an Energetic, Baroclinic Tidal Channel
Kawase, Mitsuhiro; Beba, Patricia; Fabien, Brian C.
Hypothetical power dissipation by a tidal in‐stream energy conversion device was
calculated for Admiralty Inlet, Washington, a highly energetic entrance channel to
Puget Sound and currently a candidate for tidal energy development. Power
dissipation was calculated for a device of a given capacity as a function of hub height
above sea bottom (z), using acoustic Doppler current profiler data taken in 2007 and
2009 at seven locations throughout the Inlet. At five of the seven locations, where
the tidal currents were predominantly bi‐directional, power dissipation density
increased roughly as ~zγ , with the exponent γ narrowly ranging from 0.62 to 0.66,
up to at least z = 18m. At two of the five sites where the water depth exceeded this
substantially, power was found to increase further with z but at slower rates with
γ = 0.19 and 0.42. The remaining two sites out of the seven were both close to
shoreline features, and the currents deviated significantly from bi‐directionality. At
one of the two the power increased at a slower rate of γ = 0.35 – 0.5, while at the
other the increase was faster with γ = 0.91 – 0.96. The increase in power with height
at the bi‐directional sites is faster than would be expected from the one‐seventh
power law applicable to turbulent channels. However, it is still slower than the
likely increase in the cost of device foundation with height, which would at a
minimum scale as ~z due to the cost of materials alone, and likely scale faster in
order for the installation to withstand the overturning moment exerted by the tidal
current. Thus, placing a tidal device high in the water column to exploit stronger
currents may not be economically attractive, given that the device operator needs to
recoup the higher cost of device foundation required.
Tue, 01 Nov 2011 00:00:00 GMThttp://hdl.handle.net/1957/418972011-11-01T00:00:00ZReference Model #1 - Tidal Energy: Resourcehttp://hdl.handle.net/1957/41896
Reference Model #1 - Tidal Energy: Resource
Polagye, Brian L.
Reference Model #1 is a tidal turbine operating in a narrow, tidal channel. The site is a generalized
version of Tacoma Narrows, Puget Sound, Washington. The resource is a mixed, mainly semidiurnal tidal
regime with two ebbs and floods each day of unequal strength (i.e., a diurnal inequality in which a
strong ebb/flood exchange is followed by a weak exchange). The diurnal inequalities provide extended
windows of weak currents for device installation and maintenance activities relative to a purely
semidiurnal tidal regime, though at the expense of reduced generation potential for equivalent peak
currents. In order to evaluate device performance, a generalized probability distribution and vertical profile for
current speeds in a mixed, mainly semidiurnal tidal regime is required. Once the distribution of velocities
is known, leading‐order device performance may be evaluated based on the device operating
parameters at each point on the distribution. These parameters include cut‐in speed, rated speed, and
power conversion efficiency.
Thu, 01 Dec 2011 00:00:00 GMThttp://hdl.handle.net/1957/418962011-12-01T00:00:00ZNNMREC Accomplishments and Impacts 2009-2013http://hdl.handle.net/1957/39929
NNMREC Accomplishments and Impacts 2009-2013
Batten, Belinda; Polagye, Brian L.
In
2008,
the
US
Department
of
Energy’s
(DOE)
Wind
and
Water
Power
Program
issued
a
funding
opportunity
announcement
to
establish
university-­‐led
National
Marine
Renewable
Energy
Centers.
Oregon
State
University
and
the
University
of
Washington
combined
their
capabilities
in
wave
and
tidal
energy
to
establish
the
Northwest
National
Marine
Renewable
Energy
Center,
or
NNMREC.
NNMREC’s
scope
included
research
and
testing
in
the
following
topic
areas:
• Advanced
Wave
Forecasting
Technologies;
• Device
and
Array
Optimization;
• Integrated
and
Standardized
Test
Facility
Development;
• Investigate
the
Compatibility
of
Marine
Energy
Technologies
with
Environment,
Fisheries
and
other
Marine
Resources;
• Increased
Reliability
and
Survivability
of
Marine
Energy
Systems;
• Collaboration/Optimization
with
Marine
Renewable
and
Other
Renewable
Energy
Resources.
To
support
the
last
topic,
the
National
Renewable
Energy
Laboratory
(NREL)
was
brought
onto
the
team,
particularly
to
assist
with
testing
protocols,
grid
integration,
and
testing
instrumentation.
NNMREC’s
mission
is
to
facilitate
the
development
of
marine
energy
technology,
to
inform
regulatory
and
policy
decisions,
and
to
close
key
gaps
in
scientific
understanding
with
a
focus
on
student
growth
and
development.
In
this,
NNMREC
achieves
DOE’s
goals
and
objectives,
and
remains
aligned
with
the
research
and
educational
mission
of
universities.
In
2012,
DOE
provided
NNMREC
an
opportunity
to
propose
an
additional
effort
to
begin
work
on
a
utility
scale
grid
connected
wave
energy
test
facility.
That
project
has
been
referred
to
as
the
Pacific
Marine
Energy
Center
(PMEC)
and
involves
work
directly
toward
establishing
the
facility,
which
will
be
in
Newport
Oregon,
as
well
as
supporting
instrumentation
for
wave
energy
converter
testing.
This
report
contains
an
overview
of
significant
accomplishments,
current
work
and
publications
produced
under
each
of
these
tasks,
as
well
as
lessons
learned
and
NNMREC’s
impact.
Impact
is
being
reported
in
terms
of
presentations
given,
graduated
and
current
students,
collaborations
and
patents.
Northwest National Marine Renewable Energy Center
Wed, 01 May 2013 00:00:00 GMThttp://hdl.handle.net/1957/399292013-05-01T00:00:00Z